|Canal|Length (miles)|Locks|Max length (ft)|Width (ft)|Year opened|Year abandoned|Year restored|
|---|---|---|---|---|---|---|---|
|Aberdeenshire Canal|18|18|||1805|1854||
|Buchan Canal||||||||
|Caledonian Canal|62|29|150|35|1822|||
|Crinan Canal|9|15|86.75|19.65|1817|||
|Dingwall Canal|1.1|0|||1816|1840||
|Forth and Clyde Canal|35|38|68.58|19.75|1790|1963|2002|
|Glasgow, Paisley and Johnstone Canal|11|0|||1811|1881||
|Monkland Canal|12.25|18|71|14|1794|1942||
|Stevenston Canal|2.25|0||13|1772|1830||
|Union Canal|31.5|3|63|12.5|1822|1930|2000|

Question: how many canals are longer than thirty miles?
Answer: 3